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We simulate the stochastic Landau-Lifshitz-Gilbert (LLG) dynamics of auniaxial nanomagnet out to sub-millisecond timescales using a graphicalprocessing unit based micromagnetic code and determine the effect ofgeometrical tilts between the spin-current and uniaxial anisotropy axes on thethermally assisted reversal dynamics. The asymptotic behavior of the switchingtime ($I\rightarrow 0$, $<\tau>\propto\exp(-\xi(1-I)^2)$) is approachedgradually, indicating a broad crossover regime between ballistic and thermallyassisted spin transfer reversal. Interestingly, the mean switching time isshown to be nearly independent of the angle between the spin current andmagnet's uniaxial axes. These results have important implications for modelingthe energetics of thermally assisted magnetization reversal of spin transfermagnetic random access memory bit cells.

Thermally-Assisted Spin-Transfer Torque Magnetization Reversal in Uniaxial Nanomagnets